package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    //切点表达式
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    /**
     * 前置通知,在通知前进行公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
    log.info("开始进行公共字段填充.......");

    //获取当前拦截的方法的数据库操作类型
        //方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获得方法上注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获得数据库操作类型
        OperationType operationType= autoFill.value();

        //获取当前被拦截的方法参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args.length == 0||args ==null){
            return;
            
        }
        Object entity = args[0];
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据不同操作类型，为对应属性通过反射赋值
        if(operationType==OperationType.INSERT){
            //为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if(operationType==OperationType.UPDATE){
            //为两个公共字段赋值

            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }


        }
    }
}
